package com.elvt.server.config;

import com.elvt.server.utils.JwtTokenUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.simp.config.ChannelRegistration;
import org.springframework.messaging.simp.config.MessageBrokerRegistry;
import org.springframework.messaging.simp.stomp.StompCommand;
import org.springframework.messaging.simp.stomp.StompHeaderAccessor;
import org.springframework.messaging.support.ChannelInterceptor;
import org.springframework.messaging.support.MessageHeaderAccessor;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.util.StringUtils;
import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
import org.springframework.web.socket.config.annotation.WebSocketMessageBrokerConfigurer;

/**
 * @Author 作者： elvt
 * @Data 时间：2022/6/1
 * @packageName 包路径： ybg_back_end
 * @Desciption 说明： webSocket配置类
 */
@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {
    @Value("{jwt.tokenHead}")
    private String tokenHead;
    @Autowired
    private JwtTokenUtil jwtTokenUtil;
    @Autowired
    private   UserDetailsService userDetailsService;
    /**
     * 添加这个Endpoint ，这样网页可以通过websocket连接上服务了
     * 也就是我们配置wescoet的服务地址，并且可以在指定是否使用socketJs
     * @param registry
     */
    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        /**
         * 1.将ws/ep路径注册为stomp的端点，用户连接这个端点可以websocket通讯，支持socketJS
         * 2.setAllowedOrigins:允许跨域
         * 3.withSockJs():支持socketJs访问
         * */
        registry.addEndpoint("/ws/ep").setAllowedOrigins("*").withSockJS();
    }


    @Override
    public void configureClientInboundChannel(ChannelRegistration registration) {
        registration.interceptors(new ChannelInterceptor() {
            @Override
            public Message<?> preSend(Message<?> message, MessageChannel channel) {

                StompHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(message, StompHeaderAccessor.class);
                    if (StompCommand.CONNECT.equals(accessor.getCommand())){
                        String token = accessor.getFirstNativeHeader("Auth-Token");
                        if (!StringUtils.isEmpty(token)){
                            String authToken = token.substring(tokenHead.length());
                            String username = jwtTokenUtil.getUserNameFromToken(authToken);
                            if (!StringUtils.isEmpty(username)){
                                UserDetails userDetails = userDetailsService.loadUserByUsername(username);

                                if (jwtTokenUtil.validateToken(authToken,userDetails)){
                                    UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(userDetails,null,userDetails.getAuthorities());
                                    SecurityContextHolder.getContext().setAuthentication(authenticationToken);
                                    accessor.setUser(authenticationToken);
                                }


                            }
                        }
                    }

                return message;
            }
        });

    }
    /**
     * 配置消息代理
     * @param registry
     */
    @Override
    public void configureMessageBroker(MessageBrokerRegistry registry) {
        //配置代理域，可以配置多个，配置代理目的地前缀为/queue,可以在配置域上项客户端推送消息
    registry.enableSimpleBroker("/queue");
    }
}
